EP 0195407 B1 19901107 - METHOD FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER
Title (en)
METHOD FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER
Publication
Application
Priority
- JP 5218085 A 19850318
- JP 21909085 A 19851003
Abstract (en)
[origin: EP0195407A1] A method for producing a glass preform for use in fabrication of an optical fiber, which comprises steps of forming a glass soot preform (1) from a glass-forming raw material, optionally heating the soot preform (1) under reduced pressure at a temperature at which the soot preform (1) is not vitrified, heating the soot preform (1) in an atmosphere comprising at least one fluorine-containing compound under reduced pressure or a pressure not lower than atmospheric pressure if the soot preform has been heated under the reduced pressure in the previous step, or under reduced pressure if the soot preform has not been heated in the previous step, and vitrifying the fluorine-added preform for a sufficient time to vitrify it, by which a glass preform having substantially no bubble therein and containing a sufficient amount of fluorine.
IPC 1-7
IPC 8 full level
C03B 37/014 (2006.01)
CPC (source: EP US)
C03B 37/01446 (2013.01 - EP US); C03B 37/0146 (2013.01 - EP US); C03B 2201/075 (2013.01 - EP US); C03B 2201/12 (2013.01 - EP US); Y10S 65/16 (2013.01 - EP US); Y10S 65/90 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0195407 A1 19860924; EP 0195407 B1 19901107; AU 5474386 A 19860925; AU 579454 B2 19881124; CA 1290942 C 19911022; CN 1020190 C 19930331; CN 86101686 A 19860917; DE 3675411 D1 19901213; US 5145507 A 19920908
DOCDB simple family (application)
EP 86103629 A 19860318; AU 5474386 A 19860314; CA 503875 A 19860312; CN 86101686 A 19860318; DE 3675411 T 19860318; US 64055691 A 19910114